软磁碟充满椎骨之间的果冻状物质契合。
Soft disks filled with a jelly-like material fit between these vertebrae.
而另一方面，首先出现喙形结构和最早尾综骨(用于支持羽毛的融合尾椎骨)的孔子鸟与现代鸟类之间几乎不存在什么不一样的地方。
On the other hand, Confuciusornis, which possessed the first beak and earliest pygostyle, or fused tail vertebrae that supported feathers, truly looks like a bird.
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